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Method for preparing mesoporous silica material

A technology of mesoporous silica and raw materials, applied in the directions of silica and silica, can solve problems such as large rice husk ash, and achieve the effects of small environmental load, easy shape control and wide application range

Active Publication Date: 2011-02-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of rice husk power generation is that a large amount of rice husk ash will be produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. The rice husk ash is ball-milled until the particle size is less than 200 mesh, so as to increase the specific surface area of ​​the raw material and thereby improve its reactivity;

[0026] B. According to the mass ratio of raw material: hydrochloric acid solution=1:5, add the hydrochloric acid solution that the molar concentration is 0.5mol / L in the ground rice husk ash of step A, stir and process at 60 ℃ for 2 hours, filter and separate Solid and liquid, to obtain intermediate raw materials and pickling solution;

[0027] C. washing the intermediate raw material obtained in step B with water to neutrality, filtering and drying;

[0028] D. According to the intermediate raw material: NaOH: CTAB: H 2 The molar ratio of O=1:0.5:0.05:150, in the neutral dry intermediate raw material obtained in step C, add sodium hydroxide, cetyltrimethylammonium bromide, water, mix and stir for 8 hours;

[0029] E. Send the mixed solution of step D into a conventional hydrothermal ...

Embodiment 2

[0032] A. Ball mill the micro-silica powder until the particle size is less than 200 mesh, so as to increase the specific surface area of ​​the raw material and thereby improve its reactivity;

[0033] B. press raw material: the mass ratio of hydrochloric acid solution=1: 4, add the hydrochloric acid solution that molar concentration is 4mol / L in the pulverized raw material of step A, stir and process 4 hours at 40 ℃ of temperature, filter and separate solid and liquid, Obtain intermediate raw materials and pickling solution;

[0034] C. washing the intermediate raw material obtained in step B with water to neutrality, filtering and drying;

[0035] D. According to the intermediate raw material: NaOH: OP-10: H 2 The molar ratio of O=1:0.2:0.1:200, in the neutral dry intermediate raw material obtained in step C, add sodium hydroxide, polyethylene glycol octylphenyl ether, water, and stir and mix for 16 hours;

[0036] E. Send the mixed solution of step D into a conventional m...

Embodiment 3

[0039] A. Will contain SiO 2 Soot and diatomaceous earth mixed raw materials are ball milled until the particle size is less than 200 mesh, so as to increase the specific surface area of ​​raw materials and thus improve their reactivity;

[0040] B. press raw material: the mass ratio of hydrochloric acid solution=1: 6, add the hydrochloric acid solution that molar concentration is 2mol / L in the pulverized raw material of step A, stir and process 3 hours at 50 ℃ of temperature, filter and separate solid and liquid, Obtain intermediate raw materials and pickling solution;

[0041] C. washing the intermediate raw material obtained in step B with water to neutrality, filtering and drying;

[0042] D. According to the intermediate raw material: NaOH: (CTAB+OP-10+C 6 h 15 o 3N):H 2 The molar ratio of O=1:0.4:0.08:160, in the neutral dry intermediate raw material obtained in step C, add sodium hydroxide, cetyltrimethylammonium bromide and polyethylene glycol octylbenzene Base e...

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Abstract

The invention provides a method for preparing a mesoporous silica material, which comprises: grinding raw materials, which comprises one or more of rice hull ash from biomass power plants, silicon dioxide(SiO2)-containing smoke dust from metallurgical enterprises, micro silicon powder from metallurgical silicon plants and natural kieselguhr minerals, into fine powder, stirring and mixing the fine powder with 0.5 to 4 mol / L solution of hydrochloric acid, processing for 2 to 4 hours at 40 to 60 DEG C and separating out an intermediate raw material; mixing the intermediate raw material, NaOH, structure director and H2O in a molar ratio of 1:0.2-0.5:0.05-0.2:150-200 and stirring for 8 to 24 hours; performing hydrothermal synthesis or microwave synthesis and regulating the pH value of the synthesis solution to 10 to 12; and drying the synthesis solution, roasting for 2 to 5 hours at 400 to 800 DEG C, and cooling to obtain the mesoporous silica material. In the invention, the provided process flow is short; the operation is simple; the application range is wide; the product performance is high; the environmental load is small; the energy consumption is low; the cost is low; the added value of the product is high; and the problem of the shortage of a mesoporous silica raw material is solved.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous silicon dioxide material, in particular to a method for preparing a mesoporous silicon dioxide material through hydrothermal or microwave synthesis techniques using silicon dioxide-containing raw materials. Background technique [0002] The advantages of mesoporous materials with pore diameters in the range of 2 to 50nm are: uniform and adjustable mesoporous pore diameter and stable skeleton structure; amorphous skeleton with a certain wall thickness and easy doping; large surface area ( About hundreds to thousands of m 2 / g), and modifiable inner surface (modification, doping); facilitates the diffusion of reactants. Mesoporous materials greatly exceed the pore size range of conventional porous materials (pore size<1.5nm) and have good stability. Their research is meaningful to energy environment, catalysis, membrane separation technology and molecular engineering. In recent years, rese...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 马文会朱文杰谢克强杨斌周阳魏奎先秦博刘大春徐林娜刘永成徐宝强伍继君戴永年
Owner KUNMING UNIV OF SCI & TECH
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